<template>
  <div class="menu">
    <el-breadcrumb class="app-breadcrumb" separator="/">
      <transition-group name="breadcrumb">
        <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
          <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{
            item.meta.title
          }}</span>
          <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
        </el-breadcrumb-item>
      </transition-group>
    </el-breadcrumb>
  </div>
</template>

<script lang="ts">
export default {
  name: 'Breadcrumb'
}
</script>

<script lang="ts" setup>
import { compile } from 'path-to-regexp'
import { ref, watch } from 'vue'
import { useRoute, useRouter, type RouteLocationMatched } from 'vue-router'

const route = useRoute()
const router = useRouter()
const levelList = ref()

const isHome = (route: RouteLocationMatched) => {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.toString().trim().toLocaleLowerCase() === 'Home'.toLocaleLowerCase()
}

const getBreadcrumb = () => {
  // only show routes with meta.title
  let matched: any[] = route.matched.filter((item) => item.meta && item.meta.title)
  const first = matched[0]
  if (!isHome(first)) {
    matched = [{ path: '/home', meta: { title: '首页' } }].concat(matched)
  }

  levelList.value = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false)
}

getBreadcrumb()

watch(route, () => {
  getBreadcrumb()
})

const pathCompile = (path: string) => {
  const { params } = route

  var toPath = compile(path)
  return toPath(params)
}

const handleLink = (item: any) => {
  const { redirect, path } = item
  if (redirect) {
    router.push(redirect)
    return
  }
  router.push(pathCompile(path))
}
</script>

<style lang="scss" scoped>
.menu {
  .app-breadcrumb.el-breadcrumb {
    // display: block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;

    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }
}
</style>
